TPS730xx
www.ti.com
SBVS054E – NOVEMBER 2004 – REVISED AUGUST 2005
TYPICAL CHARACTERISTICS (SOT23 PACKAGE) (continued)
TPS73028
RIPPLE REJECTION
vs
FREQUENCY
100
V
OUT
(mV)
90
80
Ripple Rejection (dB)
70
60
50
40
30
20
10
0
10
V
IN
= 3.8 V
C
OUT
= 10
µF
C
NR
= 0.01
µF
100
1k
10 k
100 k
1M
10 M
I
OUT
= 10 mA
V
OUT
(V)
3
2
1
0
0
20 40
60 80 100 120 140 160 180 200
Time (µs)
0
10
20
30 40
50 60
70 80
90 100
Time (µs)
V
IN
(mV)
C
NR
= 0.0047
µF
C
NR
= 0.01
µF
I
OUT
= 200 mA
4
V
EN
(V)
2
0
C
NR
= 0.001
µF
V
IN
= 3.8 V
V
OUT
= 2.8 V
I
OUT
= 200 mA
C
OUT
= 2.2
µF
T
J
= 25°C
4.8
TPS73028 OUTPUT VOLTAGE,
ENABLE VOLTAGE
vs
TIME (START-UP)
TPS73028
LINE TRANSIENT RESPONSE
3.8
I
OUT
= 200 mA
C
OUT
= 2.2
µF
C
NR
= 0.01
µF
20
0
-20
dv
0.4 V
+
µ
s
dt
Frequency (Hz)
Figure 8.
TPS73028
LOAD TRANSIENT RESPONSE
Figure 9.
POWER-UP / POWER-DOWN
Figure 10.
DROPOUT VOLTAGE
vs
OUTPUT CURRENT
250
20
∆V
OUT
(mV)
0
V
IN
= 3.8 V
C
OUT
= 10
µF
V
OUT
= 3 V
R
L
= 15
Ω
200
T
J
= 125°C
500 mV/div
V
DO
(mV)
−20
−40
300
di
0.02A
+
µ
s
dt
1mA
150
T
J
= 25°C
100
T
J
= −55°C
V
IN
I
OUT
(mA)
200
100
0
V
OUT
50
0
50 100 150 200 250 300 350 400 450 500
Time (µs)
0
1s/div
0
20 40 60 80 100 120 140 160 180 200
I
OUT
(mA)
Figure 11.
Figure 12.
Figure 13.
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE
(ESR)
vs
OUTPUT CURRENT
100
ESR, Equivalent Series Resistance (Ω)
ESR, Equivalent Series Resistance (Ω)
C
OUT
= 2.2
µF
V
IN
= 5.5 V, V
OUT
≥ 1.5 V
T
J
= −40°C to 125°C
Region of Instability
TYPICAL REGIONS OF STABILITY
EQUIVALENT SERIES RESISTANCE
(ESR)
vs
OUTPUT CURRENT
100
C
OUT
= 10 µF
V
IN
= 5.5 V
T
J
= −40°C to 125°C
Region of Instability
10
10
1
1
0.1
Region of Stability
0.01
0
0.02
0.04
0.06
0.08
0.20
I
OUT
(A)
0.1
Region of Stability
0.01
0
0.02
0.04
0.06
0.08
0.20
I
OUT
(A)
Figure 14.
Figure 15.
6
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